today's question comes from christy johnson. how do you book guests, keep them from fighting before the shows begin, decide timing and content? >> we look for well informed insightful analysts. people will strong opinions who aren't afraid to mix it up. as you can see from this green room surveillance camera, everyone gets along just fine before the red light comes on. by the end of the roundtable, i hope everyone watching has a good handle of what happened in politics that week and what to look for in the week ahead. just a reminder, you can ask me questions all week long on twitter and facebook. >>> that's all for us today. thank you for sharing part of your sunday tonight. check out "world news" with david muir tonight. and tune in wednesday for special coverage of one-on-one the candidates debate. at 9:00 eastern. i'll see you tomorrow on "good morning america." ♪ [ male announcer ] how do you turn an entrepreneur's dream... ♪ into a scooter that talks to the cloud? ♪ or make 70,000 trades a second... ♪ reach one cus